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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Cash flows from operating activities:    
Net loss $ (227,745) $ (177,440)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 2,918 2,564
Amortization and premium of marketable securities, net (3,117) (4,973)
Loss on sale or disposal of assets 51 12
Stock-based compensation expense 27,905 27,308
Changes in operating assets and liabilities:    
Accounts and other receivables 1,660 610
Prepaid and other current assets 11 235
Other assets 3,672 383
Accounts payable and accrued expenses 9,027 6,430
Other liabilities (2,415) (2,134)
Net cash used in operating activities (188,033) (147,005)
Cash flows from investing activities:    
Sales and maturities of marketable securities 391,169 484,788
Purchases of marketable securities (524,669) (329,708)
Acquisition of property and equipment (6,485) (1,433)
Net cash (used in) provided by investing activities (139,985) 153,647
Cash flows from financing activities:    
Net proceeds from stock issuances 323,832  
Proceeds from issuance of stock from employee benefit plans 2,267 1,039
Net cash provided by financing activities 326,099 1,039
Net (decrease) increase in cash and cash equivalents (1,919) 7,681
Cash and cash equivalents at beginning of period 28,871 28,356
Cash and cash equivalents at end of period 26,952 36,037
Non-cash investing activities    
Accrued construction in progress $ 711 $ 472